Magnetic-coupled phase anomaly in mixed-phase BiFeO3 thin films

Yen Chin Huang, Yi De Liou, Heng Jui Liu, Hsin Hua Lee, Yi Chun Chen, Ying Hao Chu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The rich phase diagram of rhombohedral (R)-like and tetragonal (T)-like monoclinic polymorph in strained BiFeO3 (BFO) films brings on various functionalities. Finding correlations of physical ordering parameters in this system is generally difficult because T-like and R-like phases are undistinguishable in many aspects. In this study, the magnetic-coupled structural transitions of the mixed-phase BFO at low temperatures were investigated by atomic force microscopy (AFM), X-ray diffraction (XRD), and Raman spectroscopy. To resolve the complexity resulted from the similarity between T-like and R-like phases, we analyzed the Raman spectra on a micro-scale region with various T/R ratios, which is in situ manipulated by an AFM tip carrying a dc bias. Phonons of T-like and R-like phases were thus successfully separated. Based on temperature-dependent XRD and resolved Raman spectra, we observed two isostructural transitions at around 225 K and 150 K, and they are strongly correlated with the magnetic ordering in the mixed-phase BFO film. Moreover, through the effective spin-lattice coupling, the evolution of the T/R polymorph is changed by the magnetic cooling process at low temperatures. This study provides a pathway to modulate phonon behaviors by magnetic fields in a highly strained system.

Original languageEnglish
Article number086112
JournalAPL Materials
Volume5
Issue number8
DOIs
Publication statusPublished - 2017 Aug 1

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Polymorphism
Thin films
Raman scattering
Atomic force microscopy
Magnetic refrigeration
X ray diffraction
Phonons
Temperature
Phase diagrams
Raman spectroscopy
Magnetization
Magnetic fields

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)

Cite this

Huang, Y. C., Liou, Y. D., Liu, H. J., Lee, H. H., Chen, Y. C., & Chu, Y. H. (2017). Magnetic-coupled phase anomaly in mixed-phase BiFeO3 thin films. APL Materials, 5(8), [086112]. https://doi.org/10.1063/1.4990138
Huang, Yen Chin ; Liou, Yi De ; Liu, Heng Jui ; Lee, Hsin Hua ; Chen, Yi Chun ; Chu, Ying Hao. / Magnetic-coupled phase anomaly in mixed-phase BiFeO3 thin films. In: APL Materials. 2017 ; Vol. 5, No. 8.
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Huang, YC, Liou, YD, Liu, HJ, Lee, HH, Chen, YC & Chu, YH 2017, 'Magnetic-coupled phase anomaly in mixed-phase BiFeO3 thin films', APL Materials, vol. 5, no. 8, 086112. https://doi.org/10.1063/1.4990138

Magnetic-coupled phase anomaly in mixed-phase BiFeO3 thin films. / Huang, Yen Chin; Liou, Yi De; Liu, Heng Jui; Lee, Hsin Hua; Chen, Yi Chun; Chu, Ying Hao.

In: APL Materials, Vol. 5, No. 8, 086112, 01.08.2017.

Research output: Contribution to journalArticle

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